7, The mixed fission products existing on sampling day after decay 8, The ratio of mixed fission products on sampling day (from all and deposition corrections are further decayed to counting day. tests before sampling day) to that on counting day is used to correct the beta activity of individual samples back to sampling day. 10. 11. The ratio of sr? to mixed fission products present from all tests on sampling day is used to compute the Sr’\ deposition from the individual samples, The daily values are summed to give the total deposition for the month, This value is divided by the number of actual samples in the month and multiplied by the expected number to give the final value for monthly Sr90 deposition. yThis value is as of the sampling month, pay 9. The computed beta activity oz sampling day is treated by the method of Hallden and Harley(7 to obtain the infinity gamma dose from fallout on that day. This calculation takes into account the apportionment of the computedbeta activity among the debris of different ages. 12. The daily gamma values are summed and corrected as for the monthly Sr90 deposition. The mathematical expressions are: Int a gk ete g 7 Ate - te) A; = 8 Activity on sampling day dpm/ft" A, = 6 Activity on counting day dpm/ft® i = Burst number I; _ = Yield for burst i, Me of mixed fission products at 1 day tg = Sampling day thi = Burst day Xr = Deposition constant -6- = vo kt si _. dk a a a a a ve da. a be you y GE the 7 Meat